This randomized phase III trial is studying giving octreotide acetate together with recombinant interferon alfa-2b to see how well it works compared with giving octreotide acetate together with bevacizumab in treating patients with metastatic or locally advanced, high-risk neuroendocrine tumor. Octreotide acetate and recombinant interferon alfa-2b may interfere with the growth of tumor cells and slow the growth of cancer. Monoclonal antibodies, such as bevacizumab, can block tumor growth in different ways. Some block the ability of tumor cells to grow and spread. Others find tumor cells and help kill them or carry tumor-killing substances to them. It is not yet known whether giving octreotide acetate together with recombinant interferon alfa-2b is more effective than giving octreotide acetate together with bevacizumab in treating patients with neuroendocrine tumor.

Patients receive octreotide acetate IM as in arm I on day 1 and recombinant interferon alfa-2b SC on days 1, 3, 5, 8, 10, 12, 15, 17, and 19. Treatment repeats every 21 days in the absence of disease progression or unacceptable toxicity.

IV. To compare the toxicity profile of patients treated with these two regimens.

V. To assess the prognostic and predictive value of VEGF expression in relation to progression-free survival and treatment effect.

VI. To compare response of 5HIAA, chromogranin A and neuronspecific enolase among patients with elevated levels at baseline between patients treated with octreotide plus interferon versus octreotide plus bevacizumab.

VII. To assess and compare the prognostic and predictive value of the combination of In-111 pentetreotide somatostatin-receptor scintigraphy (SRS) and CT vs. CT in relation to progression-free survival (PFS).

VIII. To assess and compare the prognostic and predictive value of the combination of SRS and CT vs. CT in relation to overall survival (OS) and time to treatment failure (TTF).

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Please refer to this study by its ClinicalTrials.gov identifier: NCT00569127